from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from typing import List, Optional
from app.api.deps import get_current_user

router = APIRouter()


class CartItem(BaseModel):
    product_id: int
    quantity: int


class CartUpdate(BaseModel):
    quantity: int


@router.get("/", summary="获取购物车商品")
async def get_cart_items(current_user: dict = Depends(get_current_user)):
    """
    3.1: 显示购物车中的所有商品
    """
    # TODO: Implement actual cart items retrieval
    return {"message": "获取购物车商品", "user_id": current_user.get("user_id"), "items": []}


@router.post("/", summary="添加商品到购物车")
async def add_to_cart(item: CartItem, current_user: dict = Depends(get_current_user)):
    """
    3.2: 加入商品到购物车
    """
    # TODO: Implement actual cart item addition
    return {"message": "商品已添加到购物车", "product_id": item.product_id, "quantity": item.quantity}


@router.delete("/{item_id}", summary="删除购物车商品")
async def remove_from_cart(item_id: int, current_user: dict = Depends(get_current_user)):
    """
    3.3: 删除购物车中的商品
    """
    # TODO: Implement actual cart item removal
    return {"message": f"购物车商品 {item_id} 已删除", "item_id": item_id}


@router.put("/{item_id}", summary="修改购物车商品数量")
async def update_cart_item(item_id: int, update_data: CartUpdate, current_user: dict = Depends(get_current_user)):
    """
    3.4: 修改购物车中商品的数量
    """
    # TODO: Implement actual cart item update
    return {"message": f"购物车商品 {item_id} 数量已更新", "item_id": item_id, "new_quantity": update_data.quantity}